Patent GB-785734-A (GB)
Title: Automatic toll ticketing system
IPC: H04M15/38
Filed: 1955-07-28
Abstract: 785,734. Automatic exchange systems. AUTOMATIC ELECTRIC LABORATORIES, Inc. July 28, 1955 [Aug. 12, 1954], No. 21839/55.. Class 40 (4). If a single predetermined digit is dialled it is registered in a register sender which controls switching apparatus to direct the call to a first destination, whereas if the same digit is dialled followed immediately by other digits forming with the first digit a plural digit code the register sender directs the call to a second destination. The system described has many of the features disclosed by Specifications 692,999 and 712,508 including a translator common to several register senders. The twomotion switch in each register sender in the prior Specifications is replaced by decoder and code-detecting circuits associated with the common translator. The system also contains means for changing the called subscriber instead of the calling subscriber when alternative code digits are dialled. The alternative code digits begin with the digit 0 and the invention is concerned with distinguishing between such a call and a call to an operator. For local calls to certain PABX only three digits need be dialled instead of seven. The prefix X in a reference indicates apparatus equivalent to that used in the Specifications mentioned above or in Specifications 565,654 or 272,872, [Class 38 (v)]. Use of common translator. In the interdigital pause after dialling of the third digit ground from wiper X1515 of the receive sequence switch X1510, Fig. 7, energizes assigner start relay XR640 which causes translator assigner X1000 to hunt for and find the calling director X300 and associate it with the decoder 400, Fig. 4, code detecting circuit 500, Fig. 5, and common translator X1300, Fig. 6. If, however, the call is local this is recognized by call register X1500, the director is dismissed and the translator is not seized. For calls to other exchanges, when the calling director is found assigner test relay XR650 pulls up. The assigner grounds the conductor XC1070-leading from the director to the codedetecting circuit 500, XR650 operates connect relays R450 and XR1710 in the decoder 400 and translator connector X1700. The code digit registers X1520, X1530, X1540, Fig. 7, mark conductors WXYZ21-WXYZ23 extending to conductors HW-HZ, TW-TZ, UWUZ, Fig. 4, so that operation of R450 energizes one or more relays in the hundreds, tens and units sets, represented for the units by R410- R440. Accordingly one conductor in each of three cables C460, C470, C480 is marked to energize corresponding hundreds, tens and units relays represented by R510, R520, R550 in the code detecting circuit, Fig. 5. Therefore one of 1000 conductors terminating in block XTB1240 is marked to operate the appropriate individual translate relay, say XR1401, in the common translator X1300, Fig. 6. The translate relay registers the routing digits in coder X1800, Fig. 10, in known manner, operation of the first routing digit relay energizing translation complete relay XR810, Fig. 2, to permit release of the common equipment, any subsequent routing digits being transferred before the release becomes effective. Local calls to official PABX stations. Stations with directory numbers FL3-2200 to FL3- 2299 may be obtained by local subscribers by merely dialling three digits within the range 120-139. If a local subscriber dials the full set of digits the first two digits cause wipers X1526, X1536 to operate a digit local relay which prepares the primary selector X500. The third digit raises the wipers of X500 to the appropriate level to select an idle local selector such as X315. Meanwhile, wiper X1546 operates third digit local relay (not shown) to release the director and connect the calling line to the primary selector X500 so that the numerical digits subsequently dialled will complete the connection. In the case of dialling three digits only, these digits are registered in the normal way in code registers X1520- X1540 and a translate relay, say XR1400, operates. This relay registers three digits in the routing digit registers of coder X1800 and energizes. TA, TC, TD control relays XR1890, XR1880, XR1875. The coder X1800 and send switch X1660 co-operate to select an idle connector X325. The send sequence switch skips the remaining registers of the coder and moves to a position to send the digits in the call register X1500. Because the TC control relay is operated the digit in the first code register X1520 is skipped. However, because the TA control relay is operated the digits in the second and third code digit registers X1530, X1540 are sent to complete the connection. The function of the operated TD relay is to skip the numerical registers of X1500. Reversed charges. The same exchange may be identified by two different 3-digit codes, e.g. 031 of ZE with 1 and 361 of EMpire 1. If it is desired to reverse the charge the code digits 031 are dialled instead of 361. The call is ticketed in each case but if the code dialled begins with O the called party is charged instead of the calling party. Calls using O as the first digit. Dialling O sets the first code register X1520 appropriately to energize reverse charge relay R1600, Fig. 8. If receive sequence switch X1510 does not respond to a further digit within 2 seconds, R1600 is still holding when a pulse appears on conductor C1604 to energize the O operator relay XR1850, Fig. 10, which functions as described in the prior Specifications to route the call to an operator. If, however, the calling subscriber dials a further digit within 2 seconds the locking circuit to R1600 is broken before the operator relay can pull up and the connection is completed as described above.